I think it is C because A is missing commas, B doesn't need them and D doesn't need one.
D. Parallelism
Based on Your dictionary, it states: “Parallelism has slightly different meanings, depending on the context, but it’s about balancing the weight or structure of ideas and phrases. In rhetoric, parallelism means balancing two or more ideas or arguments that are equally important.”
(A) Arrogance
The synonym of a word is a word with the same meaning. Effrontery means acting in a rude way, thus arrogance has the closest definition to effrontery and is the synonym.
Explanation:
Every country has a <u>national</u><u> </u> anthem